黑龙江省敦密断裂带镜泊湖段地堑地热资源评价

Evaluation on the Geothermal Resources in Jingbo Lake Graben of the Dun-Mi Fault Zone in Heilongjiang Province

对黑龙江省敦密断裂带镜泊湖段地堑地热资源的研究,旨在为认识大型构造断裂带凹陷地段地热资源的形成规律及其评价提供例证。镜泊湖段地堑呈长条状展布,区域地质构造属郯庐断裂带东北延伸部分。地堑为巨厚的新近系、古近系沉积岩地层,地温梯度较高,约为3.2-4.0℃/hm,埋深2500m处的温度为90.8℃,单井的单位出水量为54m3/（d.m）,地热地质条件优越。经综合资料和计算数据推测,镜泊湖段地堑为大型地热田;按地热井的地热流体单位出水量及开采适宜性分级评价指标,镜泊湖段地堑属热水量丰富的最适宜开采的地热田。镜泊湖段地堑地热田的发现,对在敦密断裂带、依舒断裂带以及郯庐断裂带寻找地热资源有一定的启示作用。

The research on the geothermal resources in Jingbo Lake graben of the Dun Mi fault zone in Heilongjiang Province provides an example to acquire the formation rule of geothermal resources in the sag part of the large fracture zone.Jingbo Lake graben,the regional geological structure of which belongs to the northeast part of the Tan Lu fault zone,expands in the form of the long strip.The graben has quite deep sedimentary rock layer which contains Neogene system and Paleogene system,the very high geothermal gradient that is 3.2-4.0 ℃/ hm.The temperature is 90.8 ℃ at 2,500 m deep underground and the geothermal fluid output per unit is 54 m3/（d · m）.The results show that geological conditions of geotherm is very favourable.The integrated and calculated data show that the Jingbo Lake graben can be a large scale geothermal field.By the geothermal fluid output per unit of geothermal well and the evaluation indicators of the suitable classification of the geothermal water exploitation,this geothermal field belongs to the most suitablely exploited geothermal field that has the rich geothermal output.The discovery of geothermal field of Jingbo Lake graben has the positive guidance for seeking out the geothermal resource in the Dun Mi fault zone,Yi Shu fault zone and the Tan Lu fault zone.